Improve workflow-trigger registration on startup

In situation when there is a combination of
invalid trigger and/or workflow but workflow
issues are not set, boot procedure crashed.

This is due to combination of old wf/trigger
setup that was successfuly saved before special
trigger verification was introduced.

automation/service/trigger.go

@@ -436,6 +436,12 @@ func (svc *trigger) registerWorkflows(ctx context.Context, workflows ...*types.W
 			continue
 		}
 
+		if len(wf.Issues) > 0 {
+			// workflow was processed before and issues were detected
+			// and stored on the workflow; no need to continue
+			continue
+		}
+
 		if err = svc.registerWorkflow(ctx, wf, tt.FilterByWorkflowID(wf.ID)...); err != nil {
 			return err
 		}
@@ -485,7 +491,13 @@ func (svc *trigger) registerWorkflow(ctx context.Context, wf *types.Workflow, tt
 	}
 
 	if wis := validateWorkflowTriggers(wf, tt...); len(wis) > 0 {
-		return wis
+		// skip trigger registration of there is a trigger related issue(s)
+		// on a specific workflow.
+		//
+		// this really happens since we run all validation on save,
+		// but there might be workflow from the time when these checks were
+		// not in place
+		return nil
 	}
 
 	if wf.RunAs > 0 {